Click the start button
Open the "Settings" app
Open the "Devices" app
Click on "Add a printer or scanner". Wait a bit
Click on "The printer that I want isn't listed"
Select "Add a local printer or network printer with manual settings"
Click "Next"
Select "Use an existing port" (default)
Select "FILE: (print to File)", like this:

As far as I know, Quicken registers can't easily be exported as CSV files (which is probably what you meant by a text file -- comma-separated values), but Quicken reports can, and you can create a report that has the registry's full history. See the documentation, or websearch "export Quicken", for specifics.

Right on both points. I just wanted to put this interesting method out for someone to find. I wish Quicken would export and import registers to/from .csv, It seems an obvious feature, but I guess it's a business decision. One thing I was trying to get, that motivated me to try the printing trick, was the Posting Date. Alas, that does not come out either way.
– Volga89Aug 15 '16 at 1:11